#!/bin/bash
function clear_all_area() {
    local i j
#填充打字区域
    for (( i=5; i<=21, i++ ))
    do
        for (( j=3; j<=77; j=j+1 ))
        do
            #设置显示位置
            echo -e "\033[44m\033["$i";"$j"H "
        done

    done
    echo -e "\033[37;40m"


}
clear_all_area
